Effects of site preparation on soil properties and on growth, damage and nitrogen uptake in planted seedlings

In this thesis, the effects on seedling growth and damage of some sitz preparation methods have been compared. Moreover. the ell.cts ol' intensive site preparaLions, e.g. deep soil cultivation, on seedling growth and daniagc haw also been evaluated. The. cffcct of various sitc preparation methods on nitrogcn mineralisation and sccdling nitrogen uptakc and thc cffcct of high nitrogen uptake on seedling growth have also bccn studied. I n gcnc.ral, findings in this thcsis suppoit thc hypothesis that seedling growth and survival arc incrcascd by sitc preparation. Soil inversion with the humus layer covcrc.cl by rnincral soil provided high seedling growth and survival. Soil scarification niethods with the humus retained in the planting spot had high mineralisation rates. This thesis also showed that intensive site preparation methods like deep soil cultivation have to be used on sites that are rich in vcgctation or frost-pronc in order to sccurc high sccdling growth and sunrival. Dccp soil cultivation also providcs an c.vcn cnvitonnicnt for sccdlings ancl hc.ncc an cvcn stand stmcturc. IIigh sccdling nitrogen uptakc was positivc to seedling growth for nc.wly plantcd Norway spruce seedlings, and both nitrogen mineralisation and root growth were shown to be important processes to seedling nitrogen uptake. Site pre.paration was generally positive trr seedling nitrogen uptake, and 1-on1 giawth was positively aflecled by soil scaii Iicalion. The results on nitrogen and carbon loss after intensive site preparation were. contradictory, showing both an increased risk of nitrogen leaching and that no increased loss had occurred ten years aftei- soil cultivati

Author

• Fredrik Nordborg

• soil scarification
• site preparation
• soil chemicophysical properties
• seedlings
• nitrogen
• mineralization
• nitrogen cycle
• growth
• damage
• carbon
• forest trees
• carbon loss
• mineralisation
• nitrogen loss
• root growth
• seedling nitrogen uptake
• soil cultivation

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https://pub.epsilon.slu.se/34/

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oai:pub.epsilon.slu.se:34